Is Apigenin Safe Long-Term? What the Evidence Actually Shows

Apigenin has moved from chamomile tea to supplement capsules faster than the science supporting it. The flavonoid’s reputation rests on a plausible mechanism (GABA-A receptor modulation, CDK inhibition, CD38 suppression) and a growing body of cell and animal studies. What’s far less clear is whether daily supplementation at doses above what food provides is safe over months or years.

This article reviews the available evidence honestly, including its limits. Most safety data comes from preclinical work or short-term dietary exposure, not controlled long-term human trials. If you’re considering apigenin as a daily supplement, understanding the gaps matters as much as knowing the potential benefits. This is informational only and does not constitute medical advice; these statements have not been evaluated by the FDA.

What Apigenin Is and How It Works

Apigenin (4′,5,7-trihydroxyflavone) is a plant-derived flavonoid found in chamomile flowers, parsley, celery, and several other common foods. At the molecular level it interacts with multiple biological targets: it bound the benzodiazepine site in rat brain binding assays, although in cell work it inhibited GABA activation on its own and did not act through that site, so how it might ease anxiety or sleep is unsettled ^[13][23][24]; it inhibits cyclin-dependent kinases CDK2 and CDK6, which may slow the cell-cycle progression underlying its studied anti-cancer properties ^[4]; and in a purified enzyme assay it inhibited CD38, an enzyme involved in NAD+ consumption, at test-tube concentrations rather than supplement doses ^[25].

Researchers have also described anti-inflammatory activity through multiple pathways. One study found that apigenin supplementation suppressed both canonical and non-canonical inflammasome signaling in a murine colitis model, reducing intestinal injury markers ^[2]. Separate animal work in carp showed protective effects on cardiac, renal, and intestinal tissue under chemical stress, modulated through oxidative-stress and inflammatory mechanisms ^[3]. These mechanistic findings are encouraging, but nearly all of them were generated in cell lines or animal models, which do not always translate to human physiology at equivalent doses.

Short-Term Safety: What Preclinical and Dietary Data Suggest

Apigenin consumed through food (chamomile tea, parsley, celery) has a long dietary history without widespread reports of harm, and the NIH National Center for Complementary and Integrative Health says chamomile is likely safe orally in the amounts found in teas and other foods. Preclinical work is mixed: in mice, a single injected dose of 100 or 200 mg/kg raised liver enzymes and damaged liver tissue, while 25 or 50 mg/kg did not, and injected doses are not supplement doses ^[26][27]. In animal models, apigenin has been studied alongside other polyphenols as a potential guard against chemotherapy-related organ damage, with flavonoids broadly showing cytoprotective properties in these contexts ^[5].

Natural polyphenols including apigenin have been explored for radioprotective applications, and the preclinical literature on them says little about safety in people at supplement doses. A review examining corn silk, a botanical source of apigenin and related flavonoids, included a safety evaluation reporting that corn silk was found safe at 500 mg/kg body weight, though that is a whole-herb finding that says little about apigenin on its own, and rigorous clinical safety data are still needed ^[6].

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Clinical safety data for flavonoid supplements in general, not apigenin specifically at high isolated doses, includes the Cochrane review on phlebotonics, a class of plant-derived flavonoid compounds used for venous insufficiency. That systematic review, drawing on multiple randomized controlled trials in humans, found that oral phlebotonics probably cause slightly more adverse events than placebo, mostly gastrointestinal, and provided only short-term safety data ^[7]. Apigenin is a distinct compound from the phlebotonic drugs covered in that review, so this safety inference is indirect, but it adds context to the broader flavonoid safety picture.

Anti-Inflammatory Properties and Organ-Level Effects

A consistent theme across apigenin research is anti-inflammatory activity. Studies in rodent models have shown reduced inflammatory cytokine production and inhibition of inflammasome activation ^[2]. Tea-derived flavonoids, a chemical class that includes apigenin, have been reviewed for anti-inflammatory effects ^[8], but that review is not specific to apigenin and does not show benefit at supplement doses. Whether these effects persist, diminish, or cause any compensatory downregulation of immune responses with long-term use remains unstudied in humans.

In a rabbit model involving a high-cholesterol diet, a combination including apigenin alongside betulinic acid and skimmianine modulated the CD36-TLR2 signaling pathway: a pathway involved in lipid uptake and inflammatory activation ^[9]. Animal studies like this one generate hypotheses about cardiovascular benefit; they do not establish safe dosing ranges for humans. The translation from an effective animal dose to a human-equivalent dose requires careful pharmacokinetic work that has not been fully completed for apigenin.

Long-Term Safety: The Honest Evidence Gap

The most important thing to say about apigenin’s long-term safety is that it has not been studied systematically in long-term human trials. Nearly all research uses cell lines or rodent models, and study durations rarely extend beyond a few weeks even in animals. This is not unique to apigenin, it reflects the early state of the broader flavonoid supplement field, but it matters considerably for anyone planning to take concentrated doses daily for months or years.

One area warranting particular attention is apigenin’s weak phytoestrogenic activity. Apigenin belongs to the broader family of plant compounds with estrogen-receptor affinity. Research on phytoestrogens in the context of bone health notes both potential protective effects on bone density and the theoretical possibility of hormonal interference at high doses in certain populations ^[1]. People with hormone-sensitive conditions (including estrogen-receptor-positive cancers, endometriosis, or those on hormone therapies) should weigh this uncertainty carefully before supplementing.

Cancer research on apigenin is a double-edged consideration for long-term safety assessment. Laboratory and animal studies show apigenin inhibiting cancer cell proliferation through CDK and apoptosis pathways ^[4], and novel nanoarchitectures are being explored to enhance delivery in drug-resistant colorectal cancer models ^[10]. However, compounds that interfere with CDK activity and promote apoptosis theoretically interact with the body’s normal cell-turnover processes in healthy tissue as well. The implications of sustained CDK inhibition over years in non-cancerous cells are not established. This does not mean harm is likely, but it does mean the long-term profile is genuinely unknown rather than simply unconfirmed as safe.

Drug Interactions: A Clinically Significant Concern

The most concrete long-term safety concern for supplement-dose apigenin is its inhibition of cytochrome P450 enzymes in lab tests ^[19][28]specifically CYP1A2, CYP2C9, and CYP3A4. These enzymes metabolize a wide range of medications. CYP2C9 metabolizes warfarin, and apigenin inhibited CYP2C9 in lab tests (for example, losartan metabolism in human liver microsomes), but no study has shown that apigenin raises warfarin levels or bleeding risk in people ^[19][20]. CYP3A4 metabolizes certain statins (simvastatin, lovastatin) and many other common drugs. CYP1A2 handles caffeine, theophylline, and some antidepressants.

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Individuals taking warfarin, certain statins, benzodiazepines, or other CYP-substrate medications should consult a physician before adding apigenin supplements. No human study has measured how interaction risk changes with apigenin dose, and the lab inhibition data used micromolar concentrations rather than supplement doses. Chamomile tea has its own reported warfarin case, in a woman who was also taking amiodarone ^[28][19][29]. Stacking apigenin with other sedatives, including melatonin or alcohol, also warrants caution given its GABA-A binding activity.

The paper cited for vascular effects is about Scutellaria polyphenols, not apigenin, so anyone with cardiovascular conditions or taking related medications should still have medical review but should not read this as evidence of a vascular effect.

What Responsible Long-Term Use Would Look Like

Given the current evidence, a cautious approach to apigenin supplementation involves using the lowest dose that appears to serve your goal rather than escalating toward the upper end of what’s sold commercially. Many supplements provide 50 mg per serving; some go considerably higher. The dietary intake from a diet rich in chamomile, parsley, and celery, likely in the range of a few milligrams per day, has the longest safety record, even if it falls well below the doses used in preclinical studies.

Periodic review with a healthcare provider is reasonable for anyone supplementing long-term, especially those on prescription medications. There are no validated biomarkers that specifically track apigenin’s chronic effects in humans, so clinical monitoring would focus on known interaction risks: for example, INR monitoring if on warfarin, or liver enzyme checks if on concurrent statin therapy. The anti-inflammatory and organ-protective signals from preclinical work are promising ^[2][3], but they should not be used to justify escalating doses in the absence of human safety data confirming tolerability at those levels.

What the research says

Apigenin is a flavonoid found naturally in a wide range of plant foods and has been consumed by humans for centuries through diet and herbal teas. That background exposure gives some reassurance about its general tolerability. However, concentrated supplement forms deliver far more apigenin than food sources, and that gap is where most safety questions arise.

Side effects documented in research and clinical observation

No human trial has tested the long-term safety of pure apigenin supplements, so what is typical or severe at supplement doses is unknown. Animal findings are mixed: a 2024 review of mostly preclinical work concluded apigenin has low toxicity, but in mice single injected doses of 100 or 200 mg/kg raised liver enzymes. Neither result translates directly to human use over long periods ^[30][27]. Possible effects worth knowing about include:

• Hormonal activity. Apigenin has measurable estrogenic and anti-estrogenic properties depending on context. In breast cancer cells it acted through both estrogen-receptor-binding-dependent and binding-independent mechanisms, and it was a potent antagonist at both ER-alpha and ER-beta^[11], and it has been studied specifically in antiestrogen-resistant breast cancer lines^[12]. This is the reason hormone-sensitive conditions are the clearest caution on this page.
• Prolactin reduction. Apigenin is sometimes taken specifically to lower prolactin. We could not locate a human trial testing that effect, so it belongs in the untested-community-practice column rather than being described as an established pharmacological action. Either way, adjusting prolactin without knowing your baseline is not a casual thing to do.
• Sedation. Apigenin does bind the central benzodiazepine receptor, competitively displacing flunitrazepam. But in the same study it was anxiolytic in mice without sedation or muscle relaxation at doses comparable to classical benzodiazepines; a mild sedative effect appeared only at a tenfold higher dose^[13]. The mechanism behind the sedation is not settled: patch-clamp work found apigenin reduced GABA-evoked currents rather than enhancing them^[14], and in rats the sedative effect was not reversed by the benzodiazepine antagonist flumazenil, which argues against a benzodiazepine-site explanation^[15]. Caution about combining it with sedatives, anxiolytics, or alcohol remains sensible, but as a precaution rather than a documented interaction.
• Prostaglandin signalling, but not NSAID-style COX inhibition. A claim circulates that apigenin blocks COX-1 and COX-2 the way an NSAID does, and therefore threatens the stomach lining. The direct measurements do not support it. When apigenin was tested against purified COX-1 and COX-2 preparations it did not affect enzyme activity at concentrations up to 25 micromolar, even though two structurally similar flavonoids tested alongside it did; what apigenin did instead was reduce inducible COX-2 expression and lower cellular prostaglandin E2^[16]. And in the animal model of the exact harm being feared, indomethacin-induced gastric ulcer in rats, apigenin reduced the ulceration rather than worsening it^[17]. None of that is human evidence, so it is not a reason for active reassurance either, but the NSAID comparison is not supported by the enzyme data.
• Drug interactions. In laboratory studies apigenin inhibits several cytochrome P450 enzymes that clear prescription drugs: CYP1A2^[18], CYP2C9, where it measurably slowed the metabolism of the blood-pressure drug losartan^[19] and where flavones as a class inhibit at low micromolar concentrations^[20], and CYP3A4^[21]. These are in vitro findings rather than interactions measured in people, but they are the most concrete reason to check with a pharmacist before combining apigenin with prescription medication.

Pregnancy and hormonal conditions

Apigenin should be avoided during pregnancy. In rats, apigenin given on days 1 to 4 of pregnancy produced dose-dependent anti-implantation activity, and in immature ovariectomised animals it significantly increased uterine weight, uterine diameter and endometrial thickness^[22]. That is animal data, and its hormonal activity is not well characterized in pregnant women, which is exactly why the cautious position is the right one here. People with estrogen-receptor-positive cancers or other hormone-sensitive conditions should speak with their oncologist or clinician before using it.

Animal results on apigenin’s estrogen-like action are not uniform: in immature rats, 50 mg/kg given by mouth did not cause uterine growth, and the authors attributed that to poor absorption or bioavailability ^[32].

Dosing and quality concerns

Supplements are commonly sold as 50 mg capsules. The best human dose has not been established, and there is no firmly established safe upper limit for humans based on clinical trials ^[31]. Supplement quality varies considerably. Apigenin is sometimes sourced from chamomile extract or synthetic production, and third-party testing for purity and accurate labeling is not universal. Contamination and label inaccuracy are real concerns in the unregulated supplement market.

A Note on the Evidence

Most apigenin safety evidence comes from animal and cell studies; no long-term human trials confirm safety at the doses found in commercially available supplements. Individuals on warfarin, CYP-metabolized statins, benzodiazepines, or with hormone-sensitive conditions should consult a physician before use. These statements have not been evaluated by the FDA; apigenin is not intended to diagnose, treat, cure, or prevent any disease.

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Frequently Asked Questions

Has apigenin been tested in long-term human trials?

No long-term controlled human trials on apigenin supplementation have been published. Most evidence comes from cell culture studies and rodent models. The Cochrane review on flavonoid-class phlebotonics found slightly more adverse events than placebo in human trials, with only short-term safety data, but those compounds differ meaningfully from isolated apigenin ^[7]. The honest answer is that the long-term human data simply does not exist yet.

Can apigenin interfere with my medications?

Possibly, but the evidence is lab-only. In enzyme assays apigenin inhibits CYP1A2, CYP2C9, and CYP3A4, which metabolize warfarin, certain statins, benzodiazepines, and many other common drugs, and no clinical apigenin interaction study is in the evidence ^{[19][28][18][21]}. Anyone on these medications should consult a physician before supplementing, particularly at doses above what dietary sources would provide.

Does apigenin affect hormone levels?

Apigenin has weak phytoestrogenic activity, meaning it can interact with estrogen receptors. Research on phytoestrogens in the context of bone health notes both potential protective effects on bone density and possible hormonal interference at higher intakes in certain populations ^[1]. People with hormone-sensitive conditions or those on hormone therapies should discuss this specifically with their healthcare provider.

Is chamomile tea a safer way to get apigenin than supplements?

For most people, yes. Chamomile tea contains apigenin at relatively low doses with a very long history of human use and no widespread adverse reports at typical consumption levels. Concentrated supplements deliver substantially higher amounts with far less safety history. If your goal is mild relaxation or modest anti-inflammatory support, dietary sources represent the more conservatively evidenced option.

What anti-inflammatory evidence exists for apigenin?

Animal studies have shown apigenin suppressing inflammasome signaling in intestinal tissue ^[2], and flavonoids in the same chemical class demonstrate anti-inflammatory effects across reviewed literature ^[8]. Separate animal work showed apigenin protecting cardiac and renal tissue against oxidative and inflammatory injury ^[3]. These are preclinical findings and have not been confirmed in long-term human studies at supplement doses.

Is apigenin being studied for cancer prevention or treatment?

Preclinical research shows apigenin inhibiting cell-cycle progression through CDK pathways and inducing apoptosis in cancer cell lines ^[4], and nanoformulations are being explored for drug-resistant colorectal cancer models ^[10]. This research is early-stage. Apigenin is not a proven cancer treatment, and these findings do not establish that long-term supplementation prevents cancer in healthy people or is safe for that purpose.

References

1. Kaczmarski M et al. Phytoestrogens in osteoporosis. Wiadomosci lekarskie (Warsaw, Poland : 1960) (2025). PMID 40219889
2. Márquez-Flores YK et al. Apigenin supplementation protects the development of dextran sulfate sodium-induced murine experimental colitis by inhibiting canonical and non-canonical inflammasome signaling pathways. The Journal of nutritional biochemistry (2016). PMID 27012631
3. Guan T et al. Apigenin alleviates DFZ-induced cardiac, renal, and intestinal injury in carp by modulating oxidative stress and inflammatory responses. Fish & shellfish immunology (2026). PMID 41349620
4. Ahmed SA et al. Rationalizing the therapeutic potential of apigenin against cancer. Life sciences (2021). PMID 33333052
5. Navarro-Hortal MD et al. Role of flavonoids against adriamycin toxicity. Food and chemical toxicology : an international journal published for the British Industrial Biological Research Association (2020). PMID 33080329
6. Gulati A et al. Anti-cancerous effect of corn silk: a critical review on its mechanism of action and safety evaluation. 3 Biotech (2023). PMID 37361240
7. Martinez-Zapata MJ et al. Phlebotonics for venous insufficiency. The Cochrane database of systematic reviews (2020). PMID 33141449
8. Hoensch H et al. [Anti-inflammatory effects of tea-flavonoids]. Deutsche medizinische Wochenschrift (1946) (2012). PMID 23233307
9. Sabu V et al. Synergistic effect of Betulinic acid, Apigenin and Skimmianine (BASk) in high cholesterol diet rabbit: Involvement of CD36-TLR2 signaling pathway. Cytokine (2021). PMID 33667961
10. Goleij P et al. Targeting drug resistant colorectal cancer with apigenin nanoarchitectures. Translational oncology (2025). PMID 40561797
11. Collins-Burow BM et al. Estrogenic and antiestrogenic activities of flavonoid phytochemicals through estrogen receptor binding-dependent and -independent mechanisms. Nutr Cancer (2000). PMID 11525602
12. Long X et al. Apigenin inhibits antiestrogen-resistant breast cancer cell growth through estrogen receptor-alpha-dependent and estrogen receptor-alpha-independent mechanisms. Mol Cancer Ther (2008). PMID 18645020
13. Viola H et al. Apigenin, a component of Matricaria recutita flowers, is a central benzodiazepine receptors-ligand with anxiolytic effects. Planta Med (1995). PMID 7617761
14. Losi G et al. Apigenin modulates GABAergic and glutamatergic transmission in cultured cortical neurons. Eur J Pharmacol (2004). PMID 15464088
15. Zanoli P et al. Behavioral characterisation of the flavonoids apigenin and chrysin. Fitoterapia (2000). PMID 10930722
16. Al-Fayez M et al. Differential modulation of cyclooxygenase-mediated prostaglandin production by the putative cancer chemopreventive flavonoids tricin, apigenin and quercetin. Cancer Chemother Pharmacol (2006). PMID 16552572
17. Alamri ZZ Apigenin attenuates indomethacin-induced gastric ulcer in rats: emphasis on antioxidant, anti-inflammatory, anti-apoptotic, and TGF-beta1 enhancing activities. Naunyn Schmiedebergs Arch Pharmacol (2024). PMID 38842560
18. Shimada H et al. Differential mechanisms for the inhibition of human cytochrome P450 1A2 by apigenin and genistein. J Biochem Mol Toxicol (2010). PMID 20806393
19. Wang Z et al. Inhibitory effect of apigenin on losartan metabolism and CYP2C9 activity in vitro. Pharmacology (2016). PMID 27287328
20. Si D et al. Mechanism of CYP2C9 inhibition by flavones and flavonols. Drug Metab Dispos (2009). PMID 19074529
21. Kondza M et al. Characterization of the CYP3A4 enzyme inhibition potential of selected flavonoids. Molecules (2021). PMID 34069400
22. Hiremath SP et al. Antifertility and hormonal properties of flavones of Striga orobanchioides. Eur J Pharmacol (2000). PMID 10720651
23. Campbell EL et al. The dietary flavonoids apigenin and (-)-epigallocatechin gallate enhance the positive modulation by diazepam of the activation by GABA of recombinant GABA(A) receptors. Biochemical pharmacology (2004). PMID 15451406
24. Goutman JD et al. Flavonoid modulation of ionic currents mediated by GABA(A) and GABA(C) receptors. European journal of pharmacology (2003). PMID 12586201
25. Carlos Escande et al. Flavonoid Apigenin Is an Inhibitor of the NAD+ase CD38. Diabetes (2012). PMID 23172919
26. National Center for Complementary and Integrative Health (NIH) Chamomile: Usefulness and Safety. National Center for Complementary and Integrative Health (NIH) source
27. Prabhat Kumar Singh et al. Acute Exposure of Apigenin Induces Hepatotoxicity in Swiss Mice. PLoS ONE (2012). PMID 22359648
28. Fei Lin et al. Inhibitory effect of Selaginella doederleinii hieron on human cytochrome P450. Frontiers in Pharmacology (2023). PMID 36874034
29. R. Segal Warfarin interaction with Matricaria chamomilla. Canadian Medical Association Journal (2006). PMID 16636327
30. Wang C et al. Apigenin as an emerging hepatoprotective agent: current status and future perspectives. Frontiers in pharmacology (2024). PMID 39749193
31. Yajie Xu et al. Protective Roles of Apigenin Against Cardiometabolic Diseases: A Systematic Review. Frontiers in Nutrition (2022). PMID 35495935
32. Saarinen N et al. No evidence for the in vivo activity of aromatase-inhibiting flavonoids. The Journal of steroid biochemistry and molecular biology (2001). PMID 11595503
33. Ostovar M et al. Chamomile: A systematic review of adverse events. Complementary therapies in medicine (2025). PMID 40374153

These statements have not been evaluated by the Food and Drug Administration. This information is not intended to diagnose, treat, cure, or prevent any disease. Content is for informational purposes only and is not medical advice; consult a qualified healthcare provider before starting any supplement. As an Amazon Associate we earn from qualifying purchases.